Merge pull request #7641 from alalek:warnings

modules/calib3d/src/homography_decomp.cpp

@@ -447,7 +447,7 @@ int decomposeHomographyMat(InputArray _H,
     Mat K = _K.getMat().reshape(1, 3);
     CV_Assert(K.cols == 3 && K.rows == 3);
 
-    auto_ptr<HomographyDecomp> hdecomp(new HomographyDecompInria);
+    cv::Ptr<HomographyDecomp> hdecomp(new HomographyDecompInria);
 
     vector<CameraMotion> motions;
     hdecomp->decomposeHomography(H, K, motions);

modules/core/include/opencv2/core/hal/intrin_cpp.hpp

@@ -455,8 +455,10 @@ template<typename _Tp, int n> inline v_reg<_Tp, n> operator ~ (const v_reg<_Tp,
 {
     v_reg<_Tp, n> c;
     for( int i = 0; i < n; i++ )
+    {
         c.s[i] = V_TypeTraits<_Tp>::reinterpret_from_int(~V_TypeTraits<_Tp>::reinterpret_int(a.s[i]));
-        return c;
+    }
+    return c;
 }
 
 //! @brief Helper macro

modules/highgui/src/window_gtk.cpp

@@ -1983,7 +1983,7 @@ static gboolean icvOnMouse( GtkWidget *widget, GdkEvent *event, gpointer user_da
             break;
 #endif //GTK_VERSION3_4
         case GDK_SCROLL_LEFT:  cv_event = CV_EVENT_MOUSEHWHEEL;
-        case GDK_SCROLL_UP:    flags |= ((-(int)1 << 16));
+        case GDK_SCROLL_UP:    flags |= ~0xffff;
             break;
         case GDK_SCROLL_RIGHT: cv_event = CV_EVENT_MOUSEHWHEEL;
         case GDK_SCROLL_DOWN:  flags |= (((int)1 << 16));

modules/superres/src/optical_flow.cpp

@@ -65,7 +65,9 @@ namespace
         virtual void impl(InputArray input0, InputArray input1, OutputArray dst) = 0;
 
     private:
+#ifdef HAVE_OPENCL
         bool ocl_calc(InputArray frame0, InputArray frame1, OutputArray flow1, OutputArray flow2);
+#endif
 
         int work_type_;
 
@@ -85,6 +87,7 @@ namespace
     {
     }
 
+#ifdef HAVE_OPENCL
     bool CpuOpticalFlow::ocl_calc(InputArray _frame0, InputArray _frame1, OutputArray _flow1, OutputArray _flow2)
     {
         UMat frame0 = arrGetUMat(_frame0, ubuf_[0]);
@@ -116,6 +119,7 @@ namespace
 
         return true;
     }
+#endif
 
     void CpuOpticalFlow::calc(InputArray _frame0, InputArray _frame1, OutputArray _flow1, OutputArray _flow2)
     {

modules/videoio/src/cap_ffmpeg_impl.hpp

@@ -2455,11 +2455,14 @@ bool OutputMediaStream_FFMPEG::open(const char* fileName, int width, int height,
     }
 
     // write the stream header, if any
+    int header_err =
     #if LIBAVFORMAT_BUILD < CALC_FFMPEG_VERSION(53, 2, 0)
         av_write_header(oc_);
     #else
         avformat_write_header(oc_, NULL);
     #endif
+    if (header_err != 0)
+        return false;
 
     return true;
 }